Enrico Fraccaroli
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/// @file t_sigmask.c
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/// @brief
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/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <sys/unistd.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <strerror.h>
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#include <sys/wait.h>
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void sigusr1_handler(int sig)
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{
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printf("handler(sig: %d) : Starting handler.\n", sig);
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printf("handler(sig: %d) : Ending handler.\n", sig);
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}
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int main(int argc, char *argv[])
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{
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int ret;
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sigaction_t action;
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memset(&action, 0, sizeof(action));
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action.sa_handler = sigusr1_handler;
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if (sigaction(SIGUSR1, &action, NULL) == -1) {
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printf("Failed to set signal handler (%d, %s).\n", SIGUSR1, strerror(errno));
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return 1;
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}
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printf("main : Blocking signal (%d).\n", SIGUSR1);
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sigset_t mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGUSR1);
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sigprocmask(SIG_BLOCK, &mask, NULL);
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printf("main : Calling handler (%d).\n", SIGUSR1);
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ret = kill(getpid(), SIGUSR1);
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printf("main : Returning from handler (%d): %d.\n", SIGUSR1, ret);
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printf("main : Unblocking signal (%d).\n", SIGUSR1);
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sigprocmask(SIG_UNBLOCK, &mask, NULL);
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printf("main : Calling handler (%d).\n", SIGUSR1);
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ret = kill(getpid(), SIGUSR1);
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printf("main : Returning from handler (%d): %d.\n", SIGUSR1, ret);
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return 0;
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}
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